Here's some extremely helpful information I received in an email from B.B. (CEO of SRECTrade).
We've already decided that we will be selling our SRECs through this company because they are extremely attentive (and we're not even customers yet) and they sell the SRECS at the highest price I've seen and with no commission paid by the seller.
Here's what B.B. said. He really fills in the gaps for me and I finally feel like I understand how it works.
The three things I'd like to address are Registration, Meter Readings and Timing...
As you've figured out, you must have your system certified by the state before you can begin producing SRECs. When you get a state certification number, you can then either register directly with GATS or through SRECTrade if you choose to utilize our hands-free SREC selling service called EasyBid.
Once you are registered, there are two ways to get credited for the solar energy you produce. For systems under 10kW, you can elect to utilize estimates that are determined by the state and based on a number of factors including the size of your system, the panel ratings and your location. Most solar generators under 10kW elect this option because it eliminates the need to input meter readings. However, if you feel your meter can outperform the estimates, you can opt to input meter readings instead. For systems that are 10kW and above, meter readings are required. These readings are typically taken on or around the last day of each month by the solar owner and must be inputted in GATS before the last business day of the following month. It is actually based on an honor system, however, since GATS knows the size of your generator, it has an idea for what is a reasonable output. If you input numbers that are too high, the readings will be flagged by the system. For our EasyBid clients, we collect their meter readings on a monthly basis using a simple online form.
Since readings are not credited until the last business day of the following month, your SRECs for month 1, are not ready until the end of month 2 and so on. Our monthly auctions occur the first Friday of each month. So any energy you generate in June will be available on July 31st and can be sold in the August 7th auction.
I hope that helps and look forward to being more helpful in the future!